T3W4 SCGS 2023 4OLP Bio Prelim P2 MS

1 SINGAPORE CHINESE GIRLS’ SCHOOL PRELIMINARY EXAMINATION CANDIDATE NAME ANSWERS CLASS REGISTER NUMBER CENTRE NUMBER INDEX NUMBER BIOLOGY 6093/02 Paper 2 Wednesday 23 August 2023 1 hour 45 minutes No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Section A Answer all questions. Section B Answer all questions. The last question has a choice of parts to answer. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. T his question paper consists of 18 printed pages and 1 blank page. For Examiner’s Use Section A 50 Qn 7 10 Qn 8 10 9 10 Total 80

2 Section A Answer all questions. Write your answer in the spaces provided. 1 Fig. 1.1 sho ws how a blocked blood vessel outside the heart can be by passed using an artificial blood vessel. Fig. 1.1 (a) Name the blocked blood vessel and vessel A respectively. ............................................................................................................................. [2] (b) Describe how the blocked blood vessel in Fig 1.1 can affect the normal functioning of the heart. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................ . [2] vessel A artificial blood vessel fixed into vessel A blocked blood vessel -less oxygen and glucose delivered to heart muscles for aerobic respiration Heart muscle cells die leading to heart attack Blocked blood vessel: Coronary artery Vessel A: aorta

3 (c) Sometimes, instead of using an artificial blood vessel, a vein from another part in the patient’s body is used. Suggest two ways in which a vein might not be suitable for this purpose. 1 ................................................................................................................................ ................................................................................................................................... 2 ................................................................................................................................ ..........................................................